"We often refuse to accept an idea merely because the tone of voice in which it has been expressed is unsympathetic to us"

This quote by Nietzsche suggests that people often reject concepts not since they have merit or are based on logic, however because of the method which they are presented. Individuals are often delayed by a severe or unsympathetic intonation, and therefore stop working to consider the idea objectively or impartially. Simply put, our emotions and biases can influence our capability to accept or reject ideas, despite their benefit.